Minority
Minority (adj & noun) /maɪˈnɒr.ɪ.ti/ US /-ˈnɑːr.ə.ţi/
any smaller part, portion or section within a larger group, section, sector, faction, component, subgroup, element
Adjective: sectional, marginal, underground, smaller, lesser
Only a minority of the entire students could pass the difficult math test.
Antonym: majority